Labels:text | art OCR: HERBIVORE "GRINDING" JAWS SOME PLANT-FATING dinosaurs had teeth and jaws that were very efficient at grinding tough vegetation. The hadrosaurs had hundreds of self-sharpening cheek teeth with a graterlike surface. The upper jaw was hinged to move outward, so that when the jaws closed, the upper teeth slid outward and sideways across the lower teeth, grinding vegetation into a pulp. UPPER JAW HORNY BEAK Hinged to For cropping slide outward vegetation LOWER JAW EDMONTOSAURUS JAWS Packed tightly together in both Contained hundreds of cheek teeth jaws, the teeth of Edmontosaurus were replaced as they wore out.
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